[Misc] Cleanup useless print and logger (#5220)

1. Remove useless print
2. use vLLM logger
3. change useless INFO to DEBUG level

- vLLM version: release/v0.13.0
- vLLM main:
ad32e3e19c

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

examples/eplb/eplb_strategy.py

@@ -1,7 +1,6 @@
 # coding=utf-8
 # Copyright (c) Huawei Technologies Co., Ltd. 2025-2025. All rights reserved.
 import json
-import logging
 import os
 
 import matplotlib.pyplot as plt  # type: ignore
@@ -11,8 +10,6 @@ import torch
 os.environ["VLLM_USE_MODELSCOPE"] = "True"
 os.environ["VLLM_WORKER_MULTIPROC_METHOD"] = "spawn"
 
-logger = logging.getLogger("msit_logger")
-
 
 def save_matrix_to_json(output_path, file_name, deployment):
     num_layers = deployment.shape[0]